25 pin Serial
Port RS232 |
PIN |
DESCRIPTION |
1 |
SHIELD |
Ground |
2 |
TXD |
Transmit Data |
3 |
RXD |
Receive Data |
4 |
RTS |
Request to Send |
5 |
CTS |
Clear to Send |
6 |
DSR |
Data Set Ready |
7 |
GND |
System Ground |
8 |
CD |
Carrier Detect |
9 |
n/c |
(reserved for testing) |
10 |
n/c |
(reserved for testing) |
11 |
n/c |
|
12 |
n/c |
(secondary receive line) |
13 |
n/c |
(secondary clear to send) |
14 |
n/c |
(secondary transmitted data) |
15 |
n/c |
(transmitter signal element timing) |
16 |
n/c |
(secondary received data) |
17 |
n/c |
(receiver signal element timing) |
18 |
n/c |
(local loopback) |
19 |
n/c |
(secondary request to send) |
20 |
DTR |
Data Terminal Ready |
21 |
n/c |
(remote loopback / signal quality detector) |
22 |
RI |
Ring Indicator |
23 |
n/c |
(data signal rate select) |
24 |
n/c |
(transmit signal element timing) |
25 |
n/c |
(test mode) |